md: Use revalidate_disk to effect changes in size of device.

As revalidate_disk calls check_disk_size_change, it will cause
any capacity change of a gendisk to be propagated to the blockdev
inode.  So use that instead of mucking about with locks and
i_size_write.

Also add a call to revalidate_disk in do_md_run and a few other places
where the gendisk capacity is changed.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 2 insertions, 10 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 2dc35b4c20ac..2b521ee67dfa 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4858,6 +4858,7 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
                 return -EINVAL;
         set_capacity(mddev->gendisk, mddev->array_sectors);
         mddev->changed = 1;
+        revalidate_disk(mddev->gendisk);
         if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) {
                 mddev->recovery_cp = mddev->dev_sectors;
                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
@@ -5058,7 +5059,6 @@ static void end_reshape(raid5_conf_t *conf)
  */
 static void raid5_finish_reshape(mddev_t *mddev)
 {
-        struct block_device *bdev;
         raid5_conf_t *conf = mddev->private;
 
         if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
@@ -5067,15 +5067,7 @@ static void raid5_finish_reshape(mddev_t *mddev)
                         md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
                         set_capacity(mddev->gendisk, mddev->array_sectors);
                         mddev->changed = 1;
-
-                        bdev = bdget_disk(mddev->gendisk, 0);
-                        if (bdev) {
-                                mutex_lock(&bdev->bd_inode->i_mutex);
-                                i_size_write(bdev->bd_inode,
-                                             (loff_t)mddev->array_sectors << 9);
-                                mutex_unlock(&bdev->bd_inode->i_mutex);
-                                bdput(bdev);
-                        }
+                        revalidate_disk(mddev->gendisk);
                 } else {
                         int d;
                         mddev->degraded = conf->raid_disks;